Malicious PDF — malware analysis report

Static analysis result for SHA-256 c46f6b1a9d7061d6…

MALICIOUS

PDF

80.7 KB Created: 2021-09-20 19:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a4a5fd8788cb12052eb028f968609056 SHA-1: 3effa8b738418199527ed8ed36b0d286330d0ab2 SHA-256: c46f6b1a9d7061d6e02438b01f311428bc8772073165f7cd555a3ab13495edfe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://archism.ru/uplcv?utm_term=photo+editor+pro+mod PDF link annotation
    • https://best-label.com/upload/files/taroxesuzipufivaxetegafo.pdfIn PDF document text
    • https://pepsima.biz/files/file/nesewozogefisesavajajawez.pdfIn PDF document text
    • http://isgsrl.it/images/file/37439504333.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/88751298097.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/josebido.pdfIn PDF document text
    • http://ustunongel.com/image/files/vebojarubuwip.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/jisulowurujubilixowog.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/45552178804.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/73749969827.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210918122245.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/puvafaxubetifiviv.pdfIn PDF document text
    • http://chirineli.com/img/lib/file/4291619558.pdfIn PDF document text
    • https://partetesal.ir/data/file/nabipubadurazar.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/40979473026.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/47560727505.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/73842858176.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/3514308084.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/pupitujegajopawun.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/19456954482.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/62953308560.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/4493910544.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95B 17452 bytes
SHA-256: 8c75c443f9a9552533d66617beb51500b2ad3bf2253c9aff91236df3cadb084b
font_01_sfnt_off000106dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DC 10180 bytes
SHA-256: c7c78b1600f159fce60fb3e44e7eccd28dd212be431d5f5ed6f3ae26507ccfa0
font_02_sfnt_off00011da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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